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Fluid Mechanics

Fluid Mechanics
The unit of velocity head is

ft-lb/ft³
ft-lbf/lb
ft-lbf/sec
ft-lb/sec

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Fluid Mechanics
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.

NPSH required
All of these
BHP required by the pump
Head of the liquid pumped

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Fluid Mechanics
Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is

5π/2
5√2π
5π/√2
10√2π

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Fluid Mechanics
If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is

Same in both the tubes
Greater in 0.5 mm dia tube
Greater in 1 mm dia tube
Zero in both the tubes

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Fluid Mechanics
Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.

Total
Manometric
Static
Friction

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Fluid Mechanics
Which of the following produces maximum pressure difference for transportation of gases?

Fans
Vaccum pumps
Blowers
Compressors

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